Pitman.



No. 629,795. Patented Aug. I, [899.

' [L G. LINN. r

PITMAN.

- (Application filed Oct. 19, 1898.) mb Model.)

UNITED STATES PATENT OFFICE.

ROBERT GEORGE LINN, or SAWDUST VALLEY, T NNESSEE, Assicnolt, or ONE-HALF TO LEBAN ADAMS 'rRUrr r AND HARRY LOVE rnnrr'r, or

NASHVILLE, TENNESSEE.

PITMAN.

SPECIFICATION forming part of Letterman No. 629,795, dated August 1, 1899.

Application acetate 19,1898. Serial No. 693,996. (No model.)

a citizen of the United States, residing atSawdust Valley, in the county of Maury and State of Tennessee, have invented a new and useful Pitman, of which the following is a specification.

The invention relates to improvements in pitmen.

The object of the present invention is to improve the construction of that class of pitmen employing a lazy-tongs arrangement of levers and to provide'a simple one capable of transmitting the full measure of power on a crank as long as the stroke of the piston.

The invention consists in the construction and novel combination and arrangement of parts, as hereinafter fully described, illustrated in the accompanying drawings, and pointed out in the claims hereto appended.

In the drawings, Figure 1 is a perspective view of a pitman constructed in accordance with this invention. Fig. 2 is a longitudinal sectional view. Fig. 3 is a plan view of a portion of the vpitman, illustrating the. arrangement of the oscillating arms or bars.

Like numerals of reference designate corresponding parts in all the figures of the draw- 1 designates a cross-head of a piston-rod 2, mounted in suitable guides or Ways'3 and connected by a lazy-tongs system of levers witha crank t of a shaft 5, upon which is mounted a fiy-wheel 6; but instead of connecting the lazy-tongs system of levers with a crank it maybe pivoted to a wrist-pin of a drive wheel orpulley, as will be readily understood. One end of the system of levers is connected directly to the cross-head 1 and the other end of the system is similarly connected to the crank 4, and this direct arrangement enables the full power of an engine to be transmittedto the machinery to be operated.

The lazy-tongs system of levers comprises the shortlevers 12 and l l, which are pivoted at their outer ends to the cross-head,

.the long levers l6 and 17, the connecting-bars 13 and 15, and the toggle-links 18 and 19, ex-

tending from the outerends of the lovers 16 and 17 to the crank. The inner ends of the levers 12 and 14 are pivotally connected to the inner terminals of the long levers 16 and 17, which are fulcrumed at 16 at a point hetween'their ends, and the said levers 12 and.

14 are pivot-ally connected or fnlcrumed at points between their ends at 12? and 14? on the adjacent'ends of the connecting-bars 18 and 15, which centrally cross each other, he-

' ing disposed parallel with the leve'rs 12 and 14:, respectively.

The levers 12 and 1 1 are twice the length of the stroke of the piston, the distance between the pivot-points of these levers being adjacent ends of the levers 12 and 14, and the levers 16 and 17 and the bars 13 and 15, which are parallel with one another, are preferably duplicated and located at opposite sides of the other members of the lazy-ton gs system of levers. Thedistance between the pivots of the bars 13 and 151s equal to the length of the stroke of the piston.

As the piston reciprocates the lazy-tongs system of levers expands and contracts incident to the rectilinear movement of the cross- .head, and it is vibrated or oscillated vertically through the rotation .of the crank 4. In order to accommodate the system of levers to this oscillatory movement, a swinging or oscillating fulcrum is provided, and it consists of a transverse rod '7, passing centrally through the cross-bars 13 and 15, and a pair of oscillating bars or arms 9, which are connected with the frame or support 8 at a point opposite the pin of the cross-head when the same is midway the length of the stroke.

The arms9 oscillate on the pivot 11 to acequal to the length of the stroke, and the leusually employed in such arrangement and transmits the full measure of the power on a crank as long as the stroke of the piston. The swinging fulcrum oscillates vertically with the lazy-tongs system of levers, and by' duplicating the members, as before described, the strain on the pivots is equalized and is central, so that there is no liability of the pivots twisting.

What. is claimed is 1. In a-device'of the class described, the

combination of a. lazy-ton gs system of levers.

designed to be connectedwith a cross-head and comprising the short levers 12 and 14 pivoted together at. their outer ends, the long levers 16 and 17 pivoted together neartheir outer ends and having their inner terminals connected to the inner ends of the levers 12 and 14:, the crossed bars 13 and 15 pivoted to thelevers 12' and 14 at the centers thereof, and the toggle-linksconnected with the outer ends of the levers 16 and 17, and an oscillating or swinging fulcrum-connected With the bars 13 and 15, substantially as described.

2. In adevice of the class described, the

combination of the short levers 12 and 14 pivoted together at. their outer ends and designed to be connected with across-head, the long levers l6 and 17 pivoted together near their outer ends and having their inner terminals connected with the inner ends of the short levers, the toggle-links arranged at an anglev to the outer portions of the long levers, pivoted to the same and having. their outer ends pivotally connected together and designed to be attached to a crank, and an oscillating fulcrum connected with the levers, substantially as described.

3. In a device of the class described, the combinationof the short levers 12 and 14 pivoted together attheir inner ends and designed to be connected with a cross-head, the long levers fulcrumed between their ends and having their inner ends connected with the short levers and designed tobe connected at their outer ends with a' crank, bars pivoted to the short levers at points between the ends thereof, and an oscillating fulcrum or support passing through the said bars, substantially as-d'escribed.

. 4. In a device of the class described, the combination with a reciprocating cross-head, of a-lazy-tongs systemof levers comprising the short levers 12 and 14 pivoted at their outer ends to the cross-head the long levers- 16and 17 pivoted together near their outer -ends and having their inner terminals: pivoted tothe-inner ends of the levers 1'2'and14, the crossed bars 13 and 15 pivoted 'to the levers 12 and 14, at thecenters thereof, and the toggle-links connected with the outer ends of the levers 16 and 17, and an oscillating or swinging fulcrum passing through the bars 13 and 15 and connecting the same at the-centers thereof, substantial-1y as-described.

In testimony that I claim the. foregoingas my own I havehereto affixedmysignature in the presence of two witnesses.

ROBERT GEORGE LINN.

WVitnesses:

J. W. SARGENT, F. F. HOUSER. 

